tansu-storage 0.6.0

// Copyright ⓒ 2024-2025 Peter Morgan <peter.james.morgan@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use rama::{Context, Service};
use tansu_sans_io::{
    ApiKey, ErrorCode, GetTelemetrySubscriptionsRequest, GetTelemetrySubscriptionsResponse,
};
use tracing::instrument;
use uuid::Uuid;

use crate::{Error, Result, Storage};

/// A [`Service`] using [`Storage`] as [`Context`] taking [`GetTelemetrySubscriptionsRequest`] returning [`GetTelemetrySubscriptionsResponse`].
/// ```
/// use rama::{Context, Layer as _, Service, layer::MapStateLayer};
/// use tansu_sans_io::{ErrorCode, GetTelemetrySubscriptionsRequest};
/// use tansu_storage::{Error, GetTelemetrySubscriptionsService, StorageContainer};
/// use url::Url;
///
/// # #[tokio::main]
/// # async fn main() -> Result<(), Error> {
///
/// const HOST: &str = "localhost";
/// const PORT: i32 = 9092;
/// const NODE_ID: i32 = 111;
///
/// let storage = StorageContainer::builder()
///     .cluster_id("tansu")
///     .node_id(NODE_ID)
///     .advertised_listener(Url::parse(&format!("tcp://{HOST}:{PORT}"))?)
///     .storage(Url::parse("memory://tansu/")?)
///     .build()
///     .await?;
///
/// let service = MapStateLayer::new(|_| storage).into_layer(GetTelemetrySubscriptionsService);
///
/// let client_instance_id = [0; 16];
///
/// let response = service
///     .serve(
///         Context::default(),
///         GetTelemetrySubscriptionsRequest::default().client_instance_id(client_instance_id),
///     )
///     .await?;
///
/// assert_eq!(ErrorCode::None, ErrorCode::try_from(response.error_code)?);
/// # Ok(())
/// # }
/// ```
#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct GetTelemetrySubscriptionsService;

impl ApiKey for GetTelemetrySubscriptionsService {
    const KEY: i16 = GetTelemetrySubscriptionsRequest::KEY;
}

impl<G> Service<G, GetTelemetrySubscriptionsRequest> for GetTelemetrySubscriptionsService
where
    G: Storage,
{
    type Response = GetTelemetrySubscriptionsResponse;
    type Error = Error;

    #[instrument(skip(ctx, req))]
    async fn serve(
        &self,
        ctx: Context<G>,
        req: GetTelemetrySubscriptionsRequest,
    ) -> Result<Self::Response, Self::Error> {
        let _ = (ctx, req);

        let client_instance_id = *Uuid::new_v4().as_bytes();

        Ok(GetTelemetrySubscriptionsResponse::default()
            .throttle_time_ms(0)
            .error_code(ErrorCode::None.into())
            .client_instance_id(client_instance_id)
            .subscription_id(0)
            .accepted_compression_types(Some([0].into()))
            .push_interval_ms(5_000)
            .telemetry_max_bytes(1_024)
            .delta_temporality(false)
            .requested_metrics(Some([].into())))
    }
}